Work-supporting means for machine tools



July 23, 1929. w. s. DAVENPORT WORK SUPPORTING MEANS FOR MACHINE TOOLS Filed July 27, 1927 3 Sheets-Sheet INVENTOR h/t'Lllltuu IS. Davcn nml ATTORNEY July 23, 1929.

W. 5. DAVENPORT WORK SUPPORTING MEANS FOR MACHINE TOOLS Filed July 27, 1927 3 Sheets$heet INVENTOR h zllluum \S. Davenport ha ATTORNEY Jhr s. DAVEPORT WORK SUPPORTING MEANS FOR MACHINE TOOLS M ATTORNEY that fee

tltt

tttt

terrier on the letter in rent towurd the tttt tttt

t onevrron'r r:

hppltcutton tiled duly t7,

' machine or mnchine of a similar type, parts which. are slender and fruit nndwhich are he ble to springewe Another object of t e invention is to provide it construction which will insure greeter eccureicy ottheproduct then'tools previously used, dueto the fact, that the work is ulwnys eupported opposite the cutting tool, so that the work is elweys made us smell es thespece between the cutting tool and the support, end cannot be made smaller then the spuce, provided that the machine is correctly used. Another object thereof is to provide a. conetruction in-which the tools ere movable tovverdend from eech other on opposite sides oil u work piece end ere olso moveble towerd end trorn the i work iece to us to permit the work piece to be the to or working positime without eny interference with the tools. Another object ot the invention is to provide or machine tool in which the two tools ore movebly mounted on u cerrier end the currier in movubie towerd'end from the worlr piece, provision being mode wherebydihe toole move tovverd and from each other when the cerrier is moved towurd the vvorh piece. fitill other object of the invention is to provide it eingle mechanism which will edect the move ment or the cerrier towurd end drum n worlr c piece und'vvhich wiil ehtect the movement 0t two tools tovvnrd end from eech other utter the cerrier'hue been moved towerd the worlr piece. .tnturther object ot" the invention is to provide e cerrier movebletowerd the work piece with c moveble member thereon connected with the o ereting meensend hating the connection with two tech mounted onthe terrier, there being provided meens tor rceretrn the movement ot stud member on the vvorlr piece, the resistig none yielding end permitting the movement ot the member on the cerrier under the notion ot' the operuting moons in order to efit'ect the movement of the tools towerd end from ouch other or the currier hes been moved towerd the work piece. h still further object out the invention in to provide two pivotuily mounted toot holders mud n novel meene tor operoting o. ed

between euid tool hctdere to et't'ect the movetnvverd trom the vvorh.

merit ot'the toole from the cutting tool.

PATENT OFFICE.

. h. nvenronr, or eocnne'rnn, new roux, nssrqnon no nnvnrronr one root on, me, or nocnnsrnn, new ronx, A oonrom'rion.

MAN'S 180B MAUHINE TOOLS.

W27. Serial No. %8,830.

To these and other ends, the invention coni sists of certain parts and combinations of ports all of which will be hereinafter described; the novel features being pointed out in the appended claims. 1

In the drawings:

Fig. l is a side view of the mechanism with 7 parts in section; Fig. 2 is an end view of the mechanism odjw cent the work piece;

I Fig. 3 is a fragmentary view showing the manner in which the tools cooperate with the I wort:

V Fig. 4 is e similar view at right angleswith that shown in Fig. 3;

- hi 5 is a side view with pertain section, showing the tools in cooperation with the work;

hig. t is e in Fig. t;

Fig. i is a section on the line l -7, Fig. ti;

plan view at the parts shown Fig. 8 is a section on the line 8--8, Fig. 6; I

hig. 9 ie an enlarged section on the line 9-9,Fig.ti;-.

Fig. 10 ie a tragmentary enlarged view of portions of the tool operating mechanism;

- Fig. 11 is an enlarged view of the swing i member on which operates the tool open ntm vvedge;-- 1

Flfi. 12 end 13 are res tively top and side views of the upper tool older; and

Figs. 14, 15 and 16 are respectivel end, side and top views of the lower tool holders.

The work 1 which, in this instance, is in the term ct e tubular rod fed by an suitable means through a rotary chuck 2 0 any uniteble construction to successively present portions of the rod to the tools. In this instance,

the tools embody a. lower cutter 3 and an up-' peer pressure roll 4 both grooved so that from termed.

The tools are supjported in' thie inflame;

upon a reciprocate 10 earn plate 8. 0n the carriaged is mounted at eecond carriage 9 which has ribs 10 on the underside thereof operating in, transverse groove 11 in the carriage 6. A worm or ecrew 1Q, held by an annular rib 13 against turning in the carriage 6 engages screw threads 011 13116 carriage 9 9 and controls the movement of the carriage 9 on the carriage rt ith crud in view or holuhng, th cor-1 no p w, the tubular rod 1; series of rings may be riage 9 against movement on the carriage 6 a locking bolt 14 extending vertically through the carriage 9 has a head 15 operating in the groove 11, the groove 11 being of inverted a ter 3 and the latter carries thepressure roll 4.

. In this instance, a pivot rod 19 is secured in the carriage 9 by a screw 20 and projects from one side of the carriage, its outer end Y being provided with a head 21. Between this head 21 and the side of the frame 9, the two tool holders 17 and 18 are pivoted on the common pivot rod 19. The lower tool holder has an upward extension 22 with an opening 23 through which the rod 19 extends, while the upper tool holder 18 has two depending ears 24 provided with aligned openings 25 through which the rod 19 extend, the ears 24 lying on opposite sidesof the tool holder 17. At the outer end of the tool holders 17 is a depending slotted projection 26 in the slot of which the tool 1 is received being held therein by a set screw 27. A projection extends from the forward end of the tool holder 17 and the other end of this projection serves as a positioningpoint for the end of the cutter 3 so that such end of the cutter is vertically below the axis of the roller 4. r The outer end of the tool holder 18 is provided with a slot 28 in which the roller 4 is mounted, a pivoted pin 29 extending across the slot 28 serves as 2.

- bearing for the roller 4.

With the end in view of eflecting the movement of the tools toward and from the axis of rotation of the work support and also to effect the relative movement between the tools causing them to operate in engagement with the work after the tools have been brought toward the work, there is provided a novel mechanism comprising, in this instance, a cam 31 on a driven shaft 32. This cam cooperates with a roller 33 on the end of a rocking or swinging lever or member 34 which is pivoted on the shaft 35. A spring 36 is anchored at one end eccentrically to the lever 34 at 37 and at the other end to a fixed part 38 which acts on the lever 34 in a direction to maintain the roller 33 in engagement with the periphery of the cam 31. The lever 34 has above its pivot an adjustable connection with a movable member 39 which, in this instance, is pivoted at 40 to the carriage 9. This adjustable connection, in this instance, -comprises a pitman pivoted at 41 to the swinging member 39 and pivoted at 42 to the lever 34. This pitman is preferably adjustable for line adjustment and to this end comprises a central intermediate sleeve 43 having internal right and left hand threads which engage external right and left hand threads on the end pieces 44 of the pitman. ment the pivotal connection 42 with the lever 34 is adjustable and to this end the pivot 42 is mounted on a block 45, which is adjustable on a curved surface 46 formed on the lever 34 and held in its adjusted position by a bolt 47 which connects with the lever 34in the same manner as the bolt 14 illustrated in Fig. 8.

A means for resisting the movement of the member 39 or the carriage may consist of a spring 48 anchored at 49 to a fixed part and at 50 to the lever 39. This spring acts on the lever 39 tohold the latter against swinging on the pivot 40 when the lever 34 partakes of the first part of its movement and causes the lever 34 to shift the carriage 6 on the guide piece 8. Eventually an adjustable stop 51 on the work support will engage a stop '52 moving with the carriage Sand the carriage 6 will move no further under the action of the lever 34. At this time, the tools 3 and 4 are located respectively below and above the work piece 1. The carriage 6 having been stopped and the lever 34 continuing its movement under the action of the cam 31, the spring 48 will yield and permit the swinging member 39 to swing forwardly. This arrangement it will be seen provides a lost motion connection between the lever 34 and the carriage 6.

During this lost motion between the operating means for the carriage 6 and said carriage, the tools are moved into-engagement with the workpiece 1. This is effected, in this instance, through a wedged shaped member 53 pivoted at 41 to the swinging member 39 and operating between two rollers 54 and 55 arranged respectively on the two tool holdera 17 and 18. In order to vary the action of this wedge member 15 on the tool holders, one of the rollers, in this instance, the roller 55, is adjustable on its holder. This adjustment, in this instance, is provided by making the shaft 56 of the roller 55 with an eccentric portion 57 on which the roller 55 turns. The turning of this shaft 56 shifts the eccentric portion 57 and thereby varies the position of the axis of turning of the roller 55. The wedge member when it is forced in between the two rollers 54 and 55 swing the tool carriers 17 and 18 on their pivot 19 and move the two tools 3 and 4 into engagement with the work. As the work rotates in the direction of the arrow Fig. 5 the lower cutter 3 will form grooves in the work piece while the upper roll 4 will exert pressure on the work piece to hold it toward the cutter 3. A spring pressed plunger 58 carried by the tool holder 18 acts on the tool holder 17 and the tool hold" er 17 is also acted upon by another ring plunger 59 mounted on the carriage 9. These two plungers tend normally to-hold the two For rongh adjustv trainee rollers 54 and 55 with yielding pressure tothatthe parts are in the'positions shown in till Fig. l at this time the portionof the tubular 'rod 1 is projected from the chuck or workholder 2. Thereafter, the lever 3% begins to swing under the action of the cam 31 which first imparts movement to the carriage 6 through the pitman connectiontt and the swinging member 39, but the swinging member does not move on the carriage. Eventually the abutment 52 will engage the abutment til and at this time the tools will be diametrically opposite each other on opposite sides of the axis of turni of the work piece. its soon as the carriage 6 is stopped by the abutments 51 and 52, the lever 39 begins to swing on its pivot 40 and forces the wedge 53 between the rollers 5t and 55, thus moving both tools 3 and at in engagement with the worlr piece. The wedge is so formed that, by the time it reaches the high point, grooves will he cut the desired depth in the work piece. When the high point is reached, the lever 34 begins to recede and moves the wedge 55 rearwardly so that the tools 3' and 4 are first separated, Thereafter, the carriage 6 begins to recede until the parts again asse the position shown in Fig. l, The adjustable connection between the lever 3t and the swing ing member 239 permits the movement of the tools 3 and 4 to be varied so as to operate upon work of difi'erent diameters. The longer the connection between these two parts 4 the greater will be the throw of the wedge 53. The carriage 9 is adjustable on the carriage b so that the position of the tools may be shifted in the direction of the axis of rot-ation of thework piece;

at l claim as my invention and desire to secure by lhetters Patent is:

' l. A machine tool comprising a work support; a carrier movable toward and from the work support, a pair of tools movable on the carrier to engage the work and movable therefill with to and from the work support, mecha nism for moving the carrier to move the tools to work engagin position, and means on the carrier actuated hy the carrier moving mechanism for moving the tools into engagement with the worlr.

2.. A machine tool comprising a work sup port, a carrier movable toward and from the work supporha pair of tools movable on the carrierto engage the work and movable therer with to and from the work support, mechanism for moving the carrier to move the tools to work engaging position, a substantially wedge shaped member on the carrier operative to move the tools into engagement with the work, and a connection between the carrier moving mechanism and the wedge for actuating the latter.

3. A machine tool comprising a work support, a carrier movable toward and from the work su port, a pair of tool holders movably mounte on the carrier, tools on the tool holders, a member also movably mounted on the carrier, a connection between said memberand the tool holders forjefi'ecting the movement of the tools on the tool holders toward and from each other, means connected moves the carrier toward the work support,

and then moves the member to effect the movement of the tools on the tool holders to- Ward each other.

t. A. machine tool comprising a work support, a carrier movable toward and from the work support, a. pair of tool holders movably mounted on the carrier, tools on the tool holders, a member also movably mounted on the carrier, a wedge operated by said memher to move the tools on the tool holder toward each other, resilient means opposing the movement of said member on the carrier, and means connected to said member for first moving the carrier therethrough and then moving the member on the carrier to move the wedge in order to efl'ect the movement of the tools toward each other.

5. A machine tool comprising a work support, a carrier movahletoward and from the work support, a pair of copivoted tool holders movable on the carrier, tools on the holders, a member pivoted to the carrier, a wedge moved by said member and operating on the two tool holders to effect the movement of the tools toward each other, resilient means opposin the movement of the pivoted member, an means connected to said pivoted member for first moving thecarrier toward the work support and then moving the ivotin member to move the wedge in or or to efi ect the operation of the tools toward each other.

t. A machine tool comprising a work support, a' carrier movable toward and from the work support, a pair of tool holders movably mounted on the carrier, tools onthe holders, a pivoted member also movably mounted on the carrier, a wedge moved by mud member and cooperating with both tool supports to effect the movement of the tools toward each ill) lllli let other means for resisting the movement of the pivoted member on the carrier, and mechanism connected with the pivoted member to move the carrier toward the work support and thereafter to move the pivoted member on the carrier-to move the tools toward each other, said mechanism having adjustable means therein for varying the throw of the pivoted member on the carrier.

7. A machine tool comprising a work support, a carrier movable toward and from the work support, a pair of tool holders movably mounted-on the carrier, tools on the tool holders, a member also movable on the carrier,

connection between said member and the tool 7 holders for effecting the movement of the tool holders toward and from each other, means for resisting the movement of the memberon the carrier, a pitman pivotally connected to said member, a lever, to which the other end holders toward and. from each other, means for resisting the movement of the member on the carrier, a pitman pivotally connected to said member, a lever to which the other end of the pitman is connected, and means for adusting the length of the pitman.

9. A machine tool comprising a work support, a carrier movable toward and from the work support, a pair of tools, supports on the carrier in which the tools are mounted for movement with the carrier to work engaging position and on the carrier to engage the tools with the work, and means for moving the carrier to move the tool supports to work engaging position and thereafter into engagement with the work.

10. A machine tool comprising a work support, a carrier movable toward and from the work support, a pair of tool supports pivoted on the carrier to swing toward and from each other to engage the work between them, tools in said supports, a device mounted on the carrier and movable transversely of the axis of the tool supports for engaging thetool supports and moving the'tools into engagement; v with the work, and means for moving the cal rier to move the tools to work engagmg poet tion and actuating said device to move the tools into engagement with the work.

' w. s. DAVENPORT. 1 

